Need help with this problem: The following system information is given as a base case condition for an aerobic completely mixed activated sludge system operation. Influent flow rate: 10,000 m^3/day Influent COD (100% biodegradable): 200 mg/L Influent nbVSS:10 mg/L Influent TKN: negligible Solids production: 700 kg VSS/day Aeration tank volume: 2000 m^3 Aeration tank MLVSS concentration: 3000 mg/L a) What is the oxygen requirement in kg O2/day? Assuming no nitrification is occurring b) What is the system SRT? c) If oxygen demand is instead satisfied by adding nitrate (e.g., treating wastewater stream that contains nitrate for denitrification and nitrogen removal), how much nitrate would have to be added in kg/day? d) In a new scenario, the wastewater influent contains 30 mg/L of TKN and 80% of it needs to be nitrified, assuming all other operational parameters are kept the same, will oxygen requirement increase, decrease or not change compared to the base case condition? Please explain your answer?
Need help with this problem: The following system information is given as a base case condition for an aerobic completely mixed activated sludge system operation. Influent flow rate: 10,000 m^3/day Influent COD (100% biodegradable): 200 mg/L Influent nbVSS:10 mg/L Influent TKN: negligible Solids production: 700 kg VSS/day Aeration tank volume: 2000 m^3 Aeration tank MLVSS concentration: 3000 mg/L a) What is the oxygen requirement in kg O2/day? Assuming no nitrification is occurring b) What is the system SRT? c) If oxygen demand is instead satisfied by adding nitrate (e.g., treating wastewater stream that contains nitrate for denitrification and nitrogen removal), how much nitrate would have to be added in kg/day? d) In a new scenario, the wastewater influent contains 30 mg/L of TKN and 80% of it needs to be nitrified, assuming all other operational parameters are kept the same, will oxygen requirement increase, decrease or not change compared to the base case condition? Please explain your answer?
